如何创建ints数组?

I'm struggling to create an array of ints in objective c.

我在objective c中创建一个ints数组。

the way I'd do this is javascript would be:

我这样做的方式是javascript:

arr = new Array ( 1, 2, 3, 4, 3, 2, 2 );

I need to use an NSMutableArray, as the values need to be updated (it's a tile map for a game).

我需要使用NSMutableArray，因为值需要更新(它是一个游戏的平面图)。

How can I do this?

我该怎么做呢?

4 个解决方案

#1

Does the array need to change length?

数组是否需要改变长度?

If not, why not use a normal array of ints:

如果没有，为什么不使用一个普通的ints数组:

int arr[] = { 1, 2, 3, 4, 3, 2, 2};

Note that an NSArray (or subclass thereof) doesn't hold int types natively, you have to create an NSNumber object.

注意，NSArray(或其子类)本身不包含int类型，您必须创建一个NSNumber对象。

If you really need an Objective-C style array, then use this:

如果您确实需要一个Objective-C样式的数组，那么使用以下方法:

int vals[] = { 1, 2, 3, 4, 3, 2, 2};  // you still need this
int n = sizeof(vals) / sizeof(vals[0]);

[NSMutableArray* array = [[NSMutableArray alloc] initWithCapacity:n];
for (int i = 0; i < n; ++i) {
    [array addObject: [NSNumber numberWithInt:vals[i]]];
}

#2

For an NSMutableArray (though a C-style array may be preferable, as suggested by Alnitak), you need to do something like this:

对于NSMutableArray(尽管c样式的数组可能更好，正如Alnitak所建议的)，您需要做以下事情:

NSMutableArray *array = [NSMutableArray arrayWithObjects: [NSNumber numberWithInt: 1], [NSNumber numberWithInt:2], nil];

(You can put as many as you want into that constructor, just separate them with commas and end with a nil.)

(您可以在构造函数中输入任意数量的内容，只需用逗号分隔它们，以nil结尾)。

You could also make an empty array ([NSMutableArray array]) and then fill it with your ints using [array addObject:[NSNumber numberWithInt:1]].

您还可以创建一个空数组([NSMutableArray数组])，然后使用[array addObject:[NSNumber numberWithInt:1]]填充它。

If you need a 2D version, take a look here.

如果你需要2D版本，请看这里。

#3

NSMutableArray can only contain Cocoa objects that inherit from NSObject (ie. Apple's classes and yours).

NSMutableArray只能包含继承自NSObject(即NSObject)的Cocoa对象。苹果的课程和你的)。

Basically for NSMutableArray you just init it like this:

对于NSMutableArray，你可以这样初始化:

myArray = [[NSMutableArray alloc] init];

and then add/delete objects as needed.

然后根据需要添加/删除对象。

Good luck!

好运！

PS: Hank's class reference is a good starting place.

注:汉克的班级推荐是一个很好的起点。

#4

In addition to Alnitak's answer, I would add that this question also suggests some confusion that I certainly felt while learning to code iPhone programming. Here are a few tips in general about programming languages on the iPhone

除了Alnitak的答案之外，我还要补充一点，这个问题也让我在学习编写iPhone编程时感到困惑。下面是一些关于iPhone编程语言的一般提示

Not all the code you write is objective-c.
并不是所有的代码都是objective-c。
You can (and often should) make use of other languages in programming, most notably C.
您可以(而且应该)在编程中使用其他语言，尤其是C语言。
Alnitak's "normal array" is a C array. It is great for storing information with primitive data types.
Alnitak的“普通数组”是一个C数组。它非常适合用原始数据类型存储信息。
If you want to store objects in your array, you use an NSArray. This is not a feature available in C. We know this immediately because it starts with "NS" (incidentally, this stands for Next Step).
如果希望在数组中存储对象，可以使用NSArray。这不是c的特性，我们马上就知道了，因为它是从“NS”开始的(顺便说一下，这表示下一步)。

#1